I've been using 7zip here pretty consistently since I found it... it also has the benefit (beyond BA's list) that, when you uncompress something, you don't have to go in and unblock files if you need to use them in a program that having Windows block files "because they came from another computer" causes problems.
"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor